Journal
NANO RESEARCH
Volume 11, Issue 12, Pages 6252-6259Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2148-z
Keywords
valley splitting; transition metal dichalcogenides; magnetic proximity effect; heterostructure; magnetic exchange field
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Funding
- National Natural Science Foundation of China [61774040]
- National Young 1000 Talent Plan of China
- Shanghai Municipal Natural Science Foundation [16ZR1402500]
- Opening project of State Key Laboratory of Functional Materials for Informatics (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences), Singapore Ministry of Education (MOE) Tier 1 [RG199/17]
- NTU Start-up grant [M4080513]
- US NSF [MRI-1229208]
- UB RENEW Institute
- Jiangsu 100 Talent
- Six Categories of Talent
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Possessing a valley degree of freedom and potential in information processing by manipulating valley features (such as valley splitting), group-VI monolayer transition metal dichalcogenides have attracted enormous interest. This valley splitting can be measured based on the difference between the peak energies of sigma(+) and sigma(-) polarized emissions for excitons or trions in direct band gap monolayer transition metal dichalcogenides under perpendicular magnetic fields. In this work, a well-prepared heterostructure is formed by transferring exfoliated WSe2 onto a EuS substrate. Circular-polarization-resolved photoluminescence spectroscopy, one of the most facile and intuitive methods, is used to probe the difference of the gap energy in two valleys under an applied out-of-plane external magnetic field. Our results indicate that valley splitting can be enhanced when using a EuS substrate, as compared to a SiO2/Si substrate. The enhanced valley splitting of the WSe2/EuS heterostructure can be understood as a result of an interfacial magnetic exchange field originating from the magnetic proximity effect. The value of this magnetic exchange field, based on our estimation, is approximately 9 T. Our findings will stimulate further studies on the magnetic exchange field at the interface of similar heterostructures.
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